Message composer icon and scroll to bottom button dark mode (#562)

Remove animations on the composer when entering/exiting edit/reply mode too.

ElementX/Resources/Assets.xcassets/Images/timelineComposerSendMessage.imageset/Contents.json

@@ -1,7 +1,7 @@
 {
   "images" : [
     {
-      "filename" : "timelineComposerSendMessage.svg",
+      "filename" : "send.svg",
       "idiom" : "universal"
     }
   ],

ElementX/Resources/Assets.xcassets/Images/timelineComposerSendMessage.imageset/send.svg

@@ -0,0 +1,3 @@
+<svg width="16" height="16" viewBox="0 0 16 16" fill="none" xmlns="http://www.w3.org/2000/svg">
+<path d="M15.404 8.96458L1.56331 15.8816C0.630627 16.3478 -0.33971 15.3477 0.116135 14.4353C0.116135 14.4353 1.83155 10.9711 2.30339 10.0637C2.77523 9.15633 3.31538 8.99926 8.33135 8.35098C8.51695 8.32697 8.6689 8.1869 8.6689 7.99982C8.6689 7.81307 8.51695 7.67301 8.33135 7.649C3.31538 7.00071 2.77523 6.84364 2.30339 5.93624C1.83155 5.02918 0.116135 1.56465 0.116135 1.56465C-0.33971 0.65258 0.630627 -0.347862 1.56331 0.118344L15.404 7.03573C16.1987 7.43257 16.1987 8.5674 15.404 8.96458Z" fill="white"/>
+</svg>

ElementX/Resources/Assets.xcassets/Images/timelineComposerSendMessage.imageset/timelineComposerSendMessage.svg

@@ -1,5 +0,0 @@
-<?xml version="1.0" encoding="UTF-8" standalone="no"?>
-<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN" "http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd">
-<svg width="100%" height="100%" viewBox="0 0 36 36" version="1.1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" xml:space="preserve" xmlns:serif="http://www.serif.com/" style="fill-rule:evenodd;clip-rule:evenodd;stroke-linejoin:round;stroke-miterlimit:2;">
-    <path d="M18,0C27.934,0 36,8.066 36,18C36,27.934 27.934,36 18,36C8.066,36 0,27.934 0,18C0,8.066 8.066,0 18,0ZM27.83,19.085L12.259,26.867C11.21,27.391 10.119,26.266 10.631,25.24C10.631,25.24 12.561,21.343 13.092,20.322C13.623,19.301 14.23,19.124 19.874,18.395C20.082,18.368 20.253,18.21 20.253,18C20.253,17.79 20.082,17.632 19.874,17.605C14.23,16.876 13.623,16.699 13.092,15.678C12.561,14.658 10.631,10.76 10.631,10.76C10.119,9.734 11.21,8.609 12.259,9.133L27.83,16.915C28.724,17.362 28.724,18.638 27.83,19.085Z" style="fill:rgb(13,189,139);"/>
-</svg>

ElementX/Resources/Assets.xcassets/Images/timelineScrollToBottom.imageset/Contents.json

@@ -1,23 +0,0 @@
-{
-  "images" : [
-    {
-      "filename" : "timelineScrollToBottom.png",
-      "idiom" : "universal",
-      "scale" : "1x"
-    },
-    {
-      "filename" : "timelineScrollToBottom@2x.png",
-      "idiom" : "universal",
-      "scale" : "2x"
-    },
-    {
-      "filename" : "timelineScrollToBottom@3x.png",
-      "idiom" : "universal",
-      "scale" : "3x"
-    }
-  ],
-  "info" : {
-    "author" : "xcode",
-    "version" : 1
-  }
-}